I'd like to change the new user welcome email for

Hi

I'd like to change the new user welcome email for the membership plugin.

Previously I have used the wp_new_user_notification hook, but it doesn't seem to be working for Membership welcome emails.

The default membership emails are not formatted and simply say "Username: ___ Password: ____" which is clearly not ideal.

How can I change this? I don't want to add any more variables, just more text like a real welcome message.

Thanks